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What gain setting would be best with this a Topping D10 (2vrms) and dt990 600 ohms?
Hi I'd like to know this answer too? I've gone for the Medium gain version so far.
The medium gain version of the O2 would be optimal because the 2Vrms output of the DAC is maximized at the higher 3.3 gain provided by the medium gain version of the O2. The 6.5 gain on the standard version would be too high (use the 2.4 gain then with the standard O2). Remember that the max voltage recommended without getting distorsion on the O2 is 7V. Therefore the maximum gain to be used with a 2V source is 3.3 (2V x 3.3 gain = 6.6V < 7), otherwise you would exceed 7V with a higher gain setting like the 6.5 high gain on the standard O2. Most DACs have 2Vrms or 2.1Vrms maximum outputs. At 2.1V, the 3.3 gain setting is maximized (2.1V x 3.3 gain = 6.93V < 7). The 6.5 gain setting is optimized with 1Vrms outputs (1Vrms x 6.5. = 6.5V < 7) like iPhones, iPad and other low voltage portable equipment. Remember than both versions of the O2 may work out at least by using the lower 1.0 (medium version ) or 2.4 (standard version) gain but then you do not take full advantage of the 7V capacity that the O2 may provide in optimal setups.